Thanks for the post!

Well, your motor Start Capacitor could be fried, or the copper pressure switch contacts could be burnt or varnished; I would check these two points first.

You can perform a Capacitor test with a voltmeter, here's a video on how to do just that:



- MTR

I forgot to ask, did you check the oil level in the pump prior to starting?
It looks as if there is a sight glass on the reservoir, if the unit was run with no oil it could be locked up.
If it has a reset it will usually be on the right top corner of the pump/motor housing under the cover. If there is no reset or it still does not work after resetting then I would UNPLUG THE UNIT and remove the cover, then try to turn the pump/motor by hand using the fan. If the pump/motor turns freely, then you need to check the continuity of the electrical connections from the power cord, pressure switch and motor connections.
If it does not turn freely and there is no visible or obvious reason, then you may need to drain the oil and remove the reservoir and gasket to inspect the pump drive. It looks as if repair parts are available to rebuild the pump if that is needed.

- MTR